<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    <!--  数据代码：通过一个对象代理另外一个对象中属性的操作(读/写)-->
    let obj1 = {x: 100}
    let obj2 = {y: 100}
    Object.defineProperty(obj2, "x", {
        get() {
            return obj1.x
        },
        set(v) {
            obj1.x = v
        }
    })
</script>
</body>
</html>
